I have been considering taking another measure of security in that my e-mails get encrypted. I know not everyone thinks about this but even with a strong password and 2factor, you are still vulnerable. The reason Gnu PG caught my eye is that it is open-source and still follows OpenPGP standards. Anyone here using this tool?
For your use case, it seems impractical.
If email security is your concern, use a service that is privacy-focused and supports end-to-end encryption. For this, I would recommend ProtonMail.
Another option is to host your own mail server which can be achieved with Mail-in-a-box.